'The end of the human race'. On the list of doomsday scenarios that could wipe out the human race, super-smart killer robots rate pretty high in the public consciousness.
All stars live by fusing hydrogen into helium. In the first step of the process, two hydrogen atoms fuse to form deuterium. In the next step, another hydrogen atom fuses with the deuterium, creating a rare isotope of helium that has two protons and one neutron in its nucleus. In the third step, two of the rare helium atoms fuse to create a single normal helium atom and two hydrogen atoms. The fusion pathway described above requires six hydrogen atoms to create one helium atomâhowever, there are two hydrogen atoms left over at the end of the process. The net result is that it takes four hydrogen atoms to make one helium atom.
Best Answer: There are 3 steps to the dissolving process: 1. The solvent particles must move apart to make room for solute particles. This process requires energy to overcome forces of attraction between solvent particles. In polar solvents these forces are stronger , so more energy is required. The first step in the dissolving process is endothermic . 2. The solute particles must separate form the other solute particles. Like in NaCl, Na cation and Cl anion are formed. This process also requires energy to overcome the forces of attraction between the solute particles.